Q .     A polygon has `54` diagonals. Then the number of sides it has is:

EAMCET 2010
A

`7`

B

`9`

C

`10`

D

` 12`

HINT

For a given `n`-sided polygon, with `D` diagonals; the relation between the sides and diagonals is `D = (n(n-3))/2.`
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